(ن) كَفَلَ يَكْفُلُ كَفْلًا وَكَفَالَةًkafala yakfulu kaflan wa-kafālatan: to be responsible for a person's upbringing or for some property, to be a guarantor. ﴿اَيُّهُمْ يَكْفُلُ مَرْيَمَ﴾ (Āl ʿImrān 3:44)
كَفِيْلٌkafīl (adjective on the pattern of فَعِيْلٌfaʿīl): a guarantor, one responsible. ﴿وَقَدْ جَعَلْتُمُ اللّٰهَ عَلَيْكُمْ كَفِيْلًا﴾ (An-Naḥl 16:91)
كِفْلٌkifl, dual كِفْلَانِkiflāni (noun, ism dhāt): (1) responsibility (2) a share (in a good or bad outcome). ﴿يُؤْتِكُمْ كِفْلَيْنِ مِنْ رَّحْمَتِهِۦ﴾ (Al-Ḥadīd 57:28); ﴿وَذَا الْكِفْلِ﴾ (Al-Anbiyāʾ 21:85)
Form IV (ifʿāl) اَكْفَلَ يُكْفِلُ اِكْفَالًاakfala yukfilu ikfālan: to make someone responsible for a thing, to entrust. ﴿فَقَالَ اَكْفِلْنِيْهَا﴾ (Ṣād 38:23)
Form II (tafʿīl) كَفَّلَ يُكَفِّلُ تَكْفِيْلًاkaffala yukaffilu takfīlan: to make someone the guardian of another. ﴿وَكَفَّلَهَا زَكَرِيَّا﴾ (Āl ʿImrān 3:37)